EP3064371B1 - Pneu sans air - Google Patents

Pneu sans air Download PDF

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Publication number
EP3064371B1
EP3064371B1 EP16158371.1A EP16158371A EP3064371B1 EP 3064371 B1 EP3064371 B1 EP 3064371B1 EP 16158371 A EP16158371 A EP 16158371A EP 3064371 B1 EP3064371 B1 EP 3064371B1
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EP
European Patent Office
Prior art keywords
rubber
reinforcing
layer
rubber layer
outer side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16158371.1A
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German (de)
English (en)
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EP3064371A1 (fr
Inventor
Makoto Sugiya
Wako Iwamura
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Publication date
Priority claimed from JP2015043964A external-priority patent/JP6408937B2/ja
Priority claimed from JP2015111265A external-priority patent/JP6487779B2/ja
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP3064371A1 publication Critical patent/EP3064371A1/fr
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Publication of EP3064371B1 publication Critical patent/EP3064371B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0016—Compositions of the tread
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0041—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C7/00—Non-inflatable or solid tyres
    • B60C7/10—Non-inflatable or solid tyres characterised by means for increasing resiliency
    • B60C7/101—Tyre casings enclosing a distinct core, e.g. foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C7/00—Non-inflatable or solid tyres
    • B60C7/10—Non-inflatable or solid tyres characterised by means for increasing resiliency
    • B60C7/102—Tyres built-up with separate rubber parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C7/00—Non-inflatable or solid tyres
    • B60C7/10—Non-inflatable or solid tyres characterised by means for increasing resiliency
    • B60C7/14—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C7/00—Non-inflatable or solid tyres
    • B60C7/10—Non-inflatable or solid tyres characterised by means for increasing resiliency
    • B60C7/14—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs
    • B60C7/146—Non-inflatable or solid tyres characterised by means for increasing resiliency using springs extending substantially radially, e.g. like spokes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
    • B60C9/2009—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords comprising plies of different materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/14—Peroxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C2001/0066—Compositions of the belt layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C2001/0075—Compositions of belt cushioning layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C2009/1871—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers with flat cushions or shear layers between belt layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0025—Modulus or tan delta
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0033—Thickness of the tread

Definitions

  • the present invention relates to an airless tire which reduces a rolling resistance while ensuring excellent steering stability.
  • the present invention also relates to an airless tire which reduces a rolling resistance and improves durability while ensuring excellent steering stability.
  • JP 2008-260514 A describes an airless tire having a structure in which a cylindrical tread ring and a hub are connected by spoke plates - the cylindrical tread ring has a ground contact surface, the hub is fixed to an axle, and the spoke plates are radially arranged.
  • EP 2 801 485 A1 discloses an airless tire having the features set forth in the preamble of claim 1, wherein a reinforcing cord layer is embedded in a tread rubber section of a tread ring.
  • US 2010/056686 A1 discloses a number of elastomer compositions which are described as being useful as an undertread or tread material of a tire.
  • the rubber compositions shown in Table 1 of US 2010/056686 A1 contain 7.5 parts by weight of zinc dimethacrylate (ZDMA) and 2.5 or 3 parts by weight of peroxide with respect to 100 parts by weight of a 35/65 rubber blend of natural rubber (NR) and polybutadiene rubber (PR).
  • ZDMA zinc dimethacrylate
  • NR natural rubber
  • PR polybutadiene rubber
  • an airless tire includes a tread ring having a cylindrical form and a ground contact surface, a hub positioned on a radial direction inner side of the tread ring and formed to be fixed to an axle, and a spoke structure formed such that the spoke structure is connecting the tread ring and the hub.
  • the tread ring includes a tread rubber layer forming the ground contact surface, and a reinforcing rubber layer formed on a tire radial direction inner side of the tread rubber layer, and the reinforcing rubber layer is formed of a rubber material obtained by co-crosslinking a rubber composition including a rubber component, an ⁇ , ⁇ -unsaturated carboxylic acid metal salt and a peroxide such that the ⁇ , ⁇ -unsaturated carboxylic acid metal salt has an amount in a range of 10 parts by weight to 80 parts by weight with respect to 100 parts by mass of the rubber component and that the rubber component has a content rate of butadiene rubber in a range of 10% by mass to 100% by mass.
  • an airless tire 1 of the present embodiment includes a cylindrical tread ring 2 that has a ground contact surface 21, a hub 3 that is positioned on a radial direction inner side of the tread ring 2 and is fixed to an axle, and a spoke 4 that connects the tread ring 2 and the hub 3.
  • the present embodiment illustrates a case where the airless tire 1 is formed as a passenger car tire.
  • the hub 3 has a disc part 31 that is fixed to the axle, and a cylindrical part 32 that is formed on an outer periphery of the disc part 31.
  • the hub 3 is formed using a metal material such as steel, aluminum alloy or magnesium alloy.
  • the spoke 4 is formed by a cast-molded body using a polymer material.
  • the spoke 4 has a plate-like shape. Multiple spokes 4 are provided along a tire circumferential direction.
  • the tread ring 2 includes a tread rubber layer 22 that forms the ground contact surface 21, and a reinforcing rubber layer 7 that is formed on a tire radial direction inner side of the tread rubber layer 22.
  • the tread ring 2 further includes an outer side reinforcing cord layer 5 that is provided closest to the tread rubber layer 22, and an inner side reinforcing cord layer 6 that is provided on a tire radial direction inner side of the outer side reinforcing cord layer 5, and the reinforcing rubber layer 7 is provided between the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6. That is, a sandwich structure is formed in which the reinforcing rubber layer 7 is sandwiched on both sides by the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6.
  • tread grooves are formed in various pattern shapes in order to impart wet performance.
  • a rubber composition that is superior in frictional force and wear resistance with respect to making contact with the ground is preferably adopted for the tread rubber layer 22.
  • the number of layers in the outer side reinforcing cord layer 5 is greater than the number of layers in the inner side reinforcing cord layer 6 on the inner side. Thereby, rigidity of the ground contact surface 21 can be easily increased. Further, on the other hand, the number of layers in the inner side reinforcing cord layer 6 is less than the number of layers in the outer side reinforcing cord layer 5. Thereby, reduction in weight can be easily achieved.
  • the outer side reinforcing cord layer 5 is structured to include a first cord ply 51 and a second cord ply 52 that is provided on the tire radial direction outer side of the first cord ply 51.
  • a width of the first cord ply 51 and a width of the second cord ply 52 are set substantially equal. “Substantially equal” includes a case where the width of the first cord ply 51 and the width of the second cord ply 52 are the same and a case where a difference between the widths is 10 mm or less.
  • the first cord ply 51 has first reinforcing cords 56 that are arrayed inclined at an angle ( ⁇ ) with respect to the tire circumferential direction.
  • the first reinforcing cords 56 are covered by a topping rubber.
  • the second cord ply 52 has second reinforcing cords 57 that are arrayed inclined at the same angle ( ⁇ ) but in an opposite orientation as the first reinforcing cords 56 with respect to the tire circumferential direction.
  • the second reinforcing cords 57 are covered by a topping rubber.
  • first reinforcing cords 56 and the second reinforcing cords 57 materials same as belt cords of a pneumatic tire, such as steel cords, may be preferably adopted.
  • high modulus organic fiber cords such as aramid, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET), having a high strength and a high elastic modulus, may also be used upon request.
  • the first reinforcing cords 56 and the second reinforcing cords 57 are positioned inclined in mutually opposite orientations with respect to the tire circumferential direction. Thereby, rigidity of the outer side reinforcing cord layer 5 is increased and the tread ring 2 is effectively reinforced. Further, when a slip angle is applied to the airless tire 1, similar to a belt cord reinforcing layer of a pneumatic tire, the outer side reinforcing cord layer 5 exhibits high resistance to an in-plane torsion, and provides excellent turning performance such as generating a cornering power.
  • the inner side reinforcing cord layer 6 is structured to include a third cord ply 61 that has third reinforcing cords 66.
  • the third reinforcing cords 66 are covered by a topping rubber.
  • the third reinforcing cords 66 of the present embodiment are arrayed parallel to the tire circumferential direction.
  • parallel to the tire circumferential direction means that the array of the third reinforcing cords 66 is substantially parallel to the tire circumferential direction.
  • an angle ( ⁇ 3) of the third reinforcing cords 66 with respect to the tire circumferential direction is, for example, about 0 ⁇ 5 degrees.
  • steel cords may be preferably adopted.
  • high modulus organic fiber cords such as aramid, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) may also be used upon request.
  • the third reinforcing cords 66 that are arrayed in the inner side reinforcing cord layer 6 rigidity of the tread ring 2 in the tire circumferential direction is increased. As a result, a shape of the ground contact surface 21 is stable during deceleration and acceleration, and brake performance and traction performance are improved. Further, the third cord ply 61 having the third reinforcing cords 66 that are arrayed parallel to the tire circumferential direction can ensure symmetry with respect to a tire circumferential direction line, while allowing reduction in weight to be achieved by being a single-layer layer.
  • Fig. 4 illustrates another embodiment of the third cord ply 61.
  • the third reinforcing cords 66 may also be arrayed parallel to the tire axial direction.
  • parallel to the tire axial direction means that the array of the third reinforcing cords 66 is substantially parallel to the tire axial direction.
  • the angle ( ⁇ 3) of the third reinforcing cords 66 with respect to the tire circumferential direction is, for example, about 90 ⁇ 5 degrees.
  • the third reinforcing cords 66 that are arrayed parallel to the tire axial direction Due to the third reinforcing cords 66 that are arrayed parallel to the tire axial direction, rigidity of the tread ring 2 in the tire axial direction is increased. As a result, when a large slip angle is applied to the airless tire 1, the shape of the ground contact surface 21 is stable and steering stability is improved. Further, the third cord ply 61 having the third reinforcing cords 66 that are arrayed parallel to the tire axial direction can ensure the symmetry with respect to the tire circumferential direction line, while allowing reduction in weight to be achieved by being a single-layer layer.
  • the symmetry with respect to the tire circumferential direction line is important.
  • the tread ring 22 deforms by distortion, causing a result that smooth rolling is difficult.
  • the angle ( ⁇ ) of the first and second reinforcing cords (56, 57) can be set in a wide range. Specifically, it is desirable that the angle ( ⁇ ) be 5 - 85 degrees. When the angle ( ⁇ ) is less than 5 degrees, the rigidity of the tread ring 2 in the tire axial direction is insufficient, and there is a risk that turning performance may be adversely affected. On the other hand, when the angle ( ⁇ ) exceeds 85 degrees, the rigidity of the tread ring 2 in the tire circumferential direction is insufficient, and there is a risk that straight travel performance, or turning performance at a small slip angle, may be adversely affected.
  • the case is illustrated where, in the outer side reinforcing cord layer 5, the first cord ply 51 is formed on the tire radial direction innermost side. However, it is also possible that at least one cord ply is provided on a further tire radial direction inner side than the first cord ply 51.
  • the case is illustrated where, in the outer side reinforcing cord layer 5, the second cord ply 52 is formed on the tire radial direction outermost side. However, it is also possible that at least one cord ply is provided on a further tire radial direction outer side than the second cord ply 52.
  • Such cord plies reinforce the tread ring 2 and improve load bearing capability of the airless tire 1, and thus are preferably adopted in tires for large loads such as tires for commercial vehicles.
  • the outer side reinforcing cord layer 5 is structured to further include a fourth cord ply 53, in which fourth reinforcing cords 58 are arrayed, on the tire radial direction outer side of the second cord ply 52.
  • a fourth cord ply 53 in which fourth reinforcing cords 58 are arrayed, on the tire radial direction outer side of the second cord ply 52.
  • Other structures that are not described using Fig. 5 are the same as those in the previous embodiment.
  • the fourth reinforcing cords 58 are arrayed parallel to the tire circumferential direction (that is, similar to the third reinforcing cords 66, an angle ( ⁇ 4) with respect to the tire circumferential direction is 0 ⁇ 5 degrees).
  • Such fourth reinforcing cords 58 increase the rigidity of the tread ring 2 in the tire circumferential direction.
  • a shape of the ground contact surface 21 is stable during deceleration and acceleration, and brake performance and traction performance are improved.
  • the fourth cord ply 53 having the fourth reinforcing cords 58 that are arrayed parallel to the tire circumferential direction can ensure the symmetry with respect to the tire circumferential direction line, while allowing reduction in weight to be achieved by being a single-layer layer.
  • an elastic modulus (E4) of the fourth reinforcing cords 58 be equal to or less than an elastic modulus (E0) of the first and second reinforcing cords (56, 57).
  • E4 of the fourth reinforcing cords 58 exceeds the elastic modulus (E0)
  • the fourth cord ply 53 becomes a working ply and, when a slip angle is applied to the airless tire 1, a sufficient cornering power cannot be generated and the turning performance is adversely affected.
  • organic fibers such as nylon may be preferably adopted.
  • Fig. 6 illustrates yet another embodiment of the outer side reinforcing cord layer 5.
  • the outer side reinforcing cord layer 5 is structured to further include a fifth cord ply 54, in which fifth reinforcing cords 59 are arrayed, on the tire radial direction inner side of the first cord ply 51.
  • the fifth reinforcing cords 59 are arrayed parallel to the tire circumferential direction (that is, similar to the third reinforcing cords 66, an angle ( ⁇ 5) with respect to the tire circumferential direction is 0 ⁇ 5 degrees).
  • Such fifth reinforcing cords 59 increase the rigidity of the tread ring 2 in the tire circumferential direction.
  • a shape of the ground contact surface 21 is stable during deceleration and acceleration, and brake performance and traction performance are improved.
  • the fifth cord layer 54 having the fifth reinforcing cords 59 that are arrayed parallel to the tire circumferential direction can ensure the symmetry with respect to the tire circumferential direction line, while allowing reduction in weight to be achieved by being a single-layer layer.
  • the sandwich structure is formed by the outer side reinforcing cord layer 5, the inner side reinforcing cord layer 6, and the reinforcing rubber layer 7 that is formed between the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6.
  • a tire radial direction distance (D) (illustrated in Fig. 3 ) between the reinforcing cords that are arrayed on the tire radial direction innermost side among the reinforcing cords of the outer side reinforcing cord layer 5 and the reinforcing cords that are arrayed on the tire radial direction outermost side among the reinforcing cords of the inner side reinforcing cord layer 6 be 3 mm or greater.
  • the reinforcing rubber layer 7 have a thickness of 3 mm or greater.
  • the following rubber composition (A) is used.
  • the rubber composition (A) contains 10 - 80 parts by weight of an ⁇ , ⁇ -unsaturated carboxylic acid metal salt with respect to 100 parts by mass of a rubber component of which a content rate of a butadiene rubber (BR) is 10 - 100% by mass, and contains a peroxide.
  • the butadiene rubber (BR) and the ⁇ , ⁇ -unsaturated carboxylic acid metal salt co-crosslink with each other with the peroxide as an initiator, and thereby, high elasticity and low heat generation, which are difficult to achieve in a conventional rubber material of a pneumatic tire, are achieved.
  • the rubber composition (A) in the tread ring 2 of the airless tire 1 significant effects on steering stability and rolling resistance can be achieved.
  • the rubber component contains 10 - 100% by mass of the butadiene rubber (BR) in the 100 parts by mass.
  • examples of the rubber for the blending include a natural rubber (NR), a styrene butadiene rubber (SBR), an isoprene rubber (IR), a chloroprene rubber (CR), a styrene isoprene butadiene rubber (SIBR), a styrene-isoprene rubber (SIR), and an epoxidized natural rubber (ENR).
  • NR natural rubber
  • SBR styrene butadiene rubber
  • IR isoprene rubber
  • CR chloroprene rubber
  • SIBR styrene isoprene butadiene rubber
  • SIR styrene-isoprene rubber
  • EMR epoxidized natural rubber
  • the content rate of the butadiene rubber (BR) is 10% or more by weight, and is preferably 20% or more by weight.
  • an upper limit of the content rate of the butadiene rubber (BR) is preferably 90% or less by weight, and more preferably 80% or less by weight.
  • the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is adopted, which is a metal salt of an ⁇ , ⁇ -unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, or itaconic acid.
  • an acrylic acid metal salt and/or a methacrylic acid metal salt are preferable, and a methacrylic acid metal salt is even more preferable.
  • the metal in the ⁇ , ⁇ -unsaturated carboxylic acid metal salt include zinc, sodium, magnesium, calcium and aluminum, among which, zinc is preferred for allowing sufficient hardness to be obtained.
  • the content of the co-crosslinking agent ( ⁇ , ⁇ -unsaturated carboxylic acid metal salt) is 10 - 80 parts by weight with respect to 100 parts by weight of the rubber component.
  • ⁇ ⁇ -unsaturated carboxylic acid metal salt
  • the content of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is below 10 parts by weight, a sufficient crosslink density cannot be obtained. Further, when the content of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt exceeds 80 parts by weight, it becomes too hard and the strength is also reduced.
  • a lower limit of the content of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is preferably 12 parts or more by weight
  • upper limit of the content of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is preferably 50 parts or less by weight and more preferably 35 parts or less by weight.
  • peroxide examples include benzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane, 2, 5-dimethyl-2, 5-di (benzoyl peroxy) hexane, t-butyl peroxy benzene, 2, 4-dichlorobenzoyl peroxide, 1, 1-di-t-butyl-peroxy-3, 3, 5-trimethyl cyclohexane, and n-butyl-4, 4-di-t-butylperoxyvalerate. These may be used either individually or in combination of two or more. Among these, the dicumyl peroxide is preferable.
  • the content of the peroxide be 0.1 - 6.0 parts by weight with respect to 100 parts by weight of the rubber component.
  • the content of the peroxide is below 0.1 parts by weight, there is a tendency that a sufficient hardness cannot be obtained.
  • the content of the peroxide exceeds 6 parts by weight, there is a tendency that the crosslink density becomes too high and the strength is reduced. From such a viewpoint, it is more preferable that a lower limit of the content of the peroxide be 0.2 parts or more by weight and an upper limit of the content of the peroxide be 2 parts or less by weight.
  • the rubber composition (A) may also contain a reinforcing filler.
  • the reinforcing filler include carbon black, silica, calcium carbonate, clay, talc, alumina, and aluminum hydroxide. However, carbon black is particularly preferred.
  • the content of the reinforcing filler be 90 parts or less by weight and more preferably 50 parts or less by weight, with respect to 100 parts by weight of the rubber component. When the content of the reinforcing filler exceeds 90 parts by weight, there is risk that excellent low heat generation cannot be achieved.
  • the rubber composition (A) may also contain compounding agents that are used in tire industry, such as zinc oxide, wax, stearic acid, oil, an anti-aging agent, and a vulcanization accelerator, within ranges such that the effect according to an embodiment of the present invention is not impaired. Since the rubber composition (A) contains the co-crosslinking agent ( ⁇ , ⁇ -unsaturated carboxylic acid metal salt), it is preferable that the rubber composition (A) do not contain a vulcanizing agent such as sulfur or a sulfur compound.
  • a vulcanizing agent such as sulfur or a sulfur compound.
  • a ratio (E* 30 /tan ⁇ 30 ) between a complex elastic modulus (E* 30 ) (unit: MPa) and a loss tangent (tan ⁇ 30 ) at 30 °C can be 700 or greater.
  • the rubber composition (A) having the ratio (E* 30 /tan ⁇ 30 ) of 700 or greater the rolling resistance can be reduced while the steering stability can be ensured as a higher level.
  • An upper limit of the ratio (E* 30 /tan ⁇ 30 ) is not particularly limited.
  • the rubber composition (A) tends to be inferior to a conventional rubber member for a pneumatic tire in extensibility and tensile strength.
  • the reinforcing rubber layer 7 that is formed of the rubber composition (A) is formed between the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6, the reinforcing rubber layer 7 becomes a neutral portion on which tension and compression do not act together. Therefore, the problem of extensibility and tensile strength is eliminated. That is, by having the sandwich structure, the advantages of the rubber composition (A) can be brought out while overcoming the disadvantages of the rubber composition (A).
  • Airless tires (tires corresponding to a tire size of 145/70R12) that each form the basic structure of Fig. 1 and 2 were prototyped, and operation stability and rolling resistance were tested.
  • Example 5 an outer side reinforcing cord layer and an inner side reinforcing cord layer are adjacent to each other, and a reinforcing rubber layer is formed on a radial direction inner side of the inner side reinforcing cord layer.
  • a reinforcing rubber layer is formed between an outer side reinforcing cord layer and an inner side reinforcing cord layer.
  • the spoke was formed using a cast molding method using a urethane resin (thermosetting resin), and was integrally formed with the tread ring and the hub.
  • the outer side reinforcing cord layer and the inner side reinforcing cord layer are as follows, and the specifications are the same for each of the tires.
  • an airless tire 1 of the present embodiment includes a cylindrical tread ring 2 that has a ground contact surface 21, a hub 3 that is positioned on a radial direction inner side of the tread ring 2 and is fixed to an axle, and a spoke 4 that connects the tread ring 2 and the hub 3.
  • the present embodiment illustrates a case where the airless tire 1 is formed as a passenger car tire.
  • the hub 3 has a disc part 31 that is fixed to the axle, and a cylindrical part 32 that is formed on an outer periphery of the disc part 31.
  • the hub 3 is formed using a metal material such as steel, aluminum alloy or magnesium alloy.
  • the spoke 4 is formed by a cast-molded body using a polymer material.
  • the spoke 4 has a plate-like shape. Multiple spokes 4 are provided along a tire circumferential direction.
  • the tread ring 2 includes a tread rubber layer 22 that forms the ground contact surface 21, and a reinforcing rubber layer 7 that is formed on a tire radial direction inner side of the tread rubber layer 22.
  • the tread ring 2 further includes an outer side reinforcing cord layer 5 that is provided closest to the tread rubber layer 22, and an inner side reinforcing cord layer 6 that is provided on a tire radial direction inner side of the outer side reinforcing cord layer 5, and the reinforcing rubber layer 7 is provided between the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6. That is, a sandwich structure is formed in which the reinforcing rubber layer 7 is sandwiched on both sides by the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6.
  • tread grooves are formed in various pattern shapes in order to impart wet performance.
  • a rubber composition that is superior in frictional force and wear resistance with respect to making contact with the ground is preferably adopted for the tread rubber layer 22.
  • the number of layers in the outer side reinforcing cord layer 5 is greater than the number of layers in the inner side reinforcing cord layer 6 on the inner side. Thereby, rigidity of the ground contact surface 21 can be easily increased. Further, on the other hand, the number of layers in the inner side reinforcing cord layer 6 is less than the number of layers in the outer side reinforcing cord layer 5. Thereby, reduction in weight can be easily achieved.
  • the outer side reinforcing cord layer 5 is structured to include a first cord ply 51 and a second cord ply 52 that is provided on the tire radial direction outer side of the first cord ply 51.
  • a width of the first cord ply 51 and a width of the second cord ply 52 are set substantially equal. “Substantially equal” includes a case where the width of the first cord ply 51 and the width of the second cord ply 52 are the same and a case where a difference between the widths is 10 mm or less.
  • the first cord ply 51 has first reinforcing cords 56 that are arrayed inclined at an angle ( ⁇ 1) with respect to the tire circumferential direction.
  • the first reinforcing cords 56 are covered by a topping rubber (G) (shown in Fig. 10 ).
  • the second cord ply 52 has second reinforcing cords 57 that are arrayed inclined at the same angle ( ⁇ 2) but in an opposite orientation as the first reinforcing cords 56 with respect to the tire circumferential direction.
  • the second reinforcing cords 57 are covered by a topping rubber.
  • first reinforcing cords 56 and the second reinforcing cords 57 materials same as belt cords of a pneumatic tire, such as steel cords, may be preferably adopted.
  • high modulus organic fiber cords such as aramid, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET), having a high strength and a high elastic modulus, may also be used upon request.
  • the first reinforcing cords 56 and the second reinforcing cords 57 are positioned inclined in mutually opposite orientations with respect to the tire circumferential direction. Thereby, rigidity of the outer side reinforcing cord layer 5 is increased and the tread ring 2 is effectively reinforced. Further, when a slip angle is applied to the airless tire 1, similar to a belt cord reinforcing layer of a pneumatic tire, the outer side reinforcing cord layer 5 exhibits high resistance to an in-plane torsion, and provides excellent turning performance such as generating a cornering power.
  • the inner side reinforcing cord layer 6 is structured to include a third cord ply 61 that has third reinforcing cords 66.
  • the third reinforcing cords 66 are covered by a topping rubber (G) (illustrated in Fig. 10 ).
  • the third reinforcing cords 66 of the present example are arrayed in parallel to the tire circumferential direction.
  • parallel to the tire circumferential direction means that the array of the third reinforcing cords 66 is substantially parallel to the tire circumferential direction.
  • an angle ( ⁇ 3) (not illustrated in the drawings) of the third reinforcing cords 66 with respect to the tire circumferential direction is, for example, about 0 ⁇ 5 degrees.
  • the third reinforcing cords 66 are spirally wound.
  • steel cords can be preferably adopted.
  • high modulus organic fiber cords such as aramid, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) can also be used upon request.
  • the third reinforcing cords 66 that are arrayed in the inner side reinforcing cord layer 6 rigidity of the tread ring 2 in the tire circumferential direction is increased. As a result, a shape of the ground contact surface 21 is stable during deceleration and acceleration, and brake performance and traction performance are improved. Further, the third cord ply 61 having the third reinforcing cords 66 that are arrayed in parallel to the tire circumferential direction can ensure symmetry with respect to the tire circumferential direction line while allowing reduction in weight to be achieved by being a single-layer layer.
  • a sandwich structure is formed by the outer side reinforcing cord layer 5, the inner side reinforcing cord layer 6, and the reinforcing rubber layer 7 that is formed between the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6.
  • the following rubber composition (A) is used for the reinforcing rubber layer 7.
  • the rubber composition (A) contains 10 - 80 parts by weight of an ⁇ , ⁇ -unsaturated carboxylic acid metal salt with respect to 100 parts by mass of a rubber component of which a content rate of a butadiene rubber (BR) is 10 - 100% by mass, and contains a peroxide.
  • the butadiene rubber (BR) and the ⁇ , ⁇ -unsaturated carboxylic acid metal salt co-cross-link with each other with the peroxide as an initiator, and thereby, high elasticity and low heat generation, which are difficult to achieve in a sulfur-vulcanized rubber, are achieved.
  • the rubber component contains 10 - 100% by mass of the butadiene rubber (BR) in the 100 parts by mass.
  • examples of the rubber for the blending include a natural rubber (NR), a styrene butadiene rubber (SBR), an isoprene rubber (IR), a chloroprene rubber (CR), a styrene isoprene butadiene rubber (SIBR), a styrene-isoprene rubber (SIR), and an epoxidized natural rubber (ENR).
  • NR natural rubber
  • SBR styrene butadiene rubber
  • IR isoprene rubber
  • CR chloroprene rubber
  • SIBR styrene isoprene butadiene rubber
  • SIR styrene-isoprene rubber
  • EMR epoxidized natural rubber
  • the content rate of the butadiene rubber (BR) is 10% or more by weight, and is preferably 20% or more by weight.
  • an upper limit of the content rate of the butadiene rubber (BR) is preferably 90% or less by weight, and more preferably 80% or less by weight.
  • the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is adopted, which is a metal salt of an ⁇ , ⁇ -unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, or itaconic acid.
  • an acrylic acid metal salt and/or a methacrylic acid metal salt are preferable, and a methacrylic acid metal salt is even more preferable.
  • the metal in the ⁇ , ⁇ -unsaturated carboxylic acid metal salt include zinc, sodium, magnesium, calcium and aluminum, among which, zinc is preferred for allowing sufficient hardness to be obtained.
  • the content of the co-crosslinking agent ( ⁇ , ⁇ -unsaturated carboxylic acid metal salt) is 10 - 80 parts by weight with respect to 100 parts by weight of the rubber component.
  • ⁇ ⁇ -unsaturated carboxylic acid metal salt
  • the content of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is below 10 parts by weight, a sufficient crosslink density cannot be obtained. Further, when the content of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt exceeds 80 parts by weight, it becomes too hard and the strength is also reduced.
  • a lower limit of the content of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is preferably 12 parts or more by weight
  • upper limit of the content of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is preferably 50 parts or less by weight and more preferably 35 parts or less by weight.
  • peroxide examples include benzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane, 2, 5-dimethyl-2, 5-di (benzoyl peroxy) hexane, t-butyl peroxy benzene, 2, 4-dichlorobenzoyl peroxide, 1, 1-di-t-butyl-peroxy-3, 3, 5-trimethyl cyclohexane, and n-butyl-4, 4-di-t-butylperoxyvalerate. These may be used either individually or in combination of two or more. Among these, the dicumyl peroxide is preferable.
  • the content of the peroxide be 0.1 - 6.0 parts by weight with respect to 100 parts by weight of the rubber component.
  • the content of the peroxide is below 0.1 parts by weight, there is a tendency that a sufficient hardness cannot be obtained.
  • the content of the peroxide exceeds 6 parts by weight, there is a tendency that the crosslink density becomes too high and the strength is reduced. From such a viewpoint, it is more preferable that a lower limit of the content of the peroxide be 0.2 parts or more by weight and an upper limit of the content of the peroxide be 2 parts or less by weight.
  • the rubber composition (A) may also contain a reinforcing filler.
  • the reinforcing filler include carbon black, silica, calcium carbonate, clay, talc, alumina, and aluminum hydroxide. However, carbon black is particularly preferred.
  • the content of the reinforcing filler be 90 parts or less by weight and more preferably 50 parts or less by weight, with respect to 100 parts by weight of the rubber component. When the content of the reinforcing filler exceeds 90 parts by weight, there is risk that excellent low heat generation cannot be achieved.
  • the rubber composition (A) may also contain compounding agents that are used in tire industry, such as zinc oxide, wax, stearic acid, oil, an anti-aging agent, and a vulcanization accelerator, within ranges such that the effect according to an embodiment of the present invention is not impaired. Since the rubber composition (A) contains the co-crosslinking agent ( ⁇ , ⁇ -unsaturated carboxylic acid metal salt), a vulcanizing agent such as sulfur and a sulfur compound is not contained.
  • the reinforcing rubber layer 7 is adjacent to the topping rubber (G) of each of the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6. That is, the topping rubber (G) forms the adjacent rubber 10.
  • the topping rubber (G) is formed of a sulfur-vulcanized rubber using sulfur as vulcanizing agent. Then, during vulcanization, a portion of the sulfur in the topping rubber (G) migrates to the reinforcing rubber layer 7 side and thereby the interface layer 11, in which the sulfur migrated into the rubber composition (A) is dispersed, is formed in the interface region.
  • a raw tread ring is formed by laminating an unvulcanized inner side reinforcing cord layer 6, an unvulcanized reinforcing rubber layer 7, an unvulcanized outer side reinforcing cord layer 5, and an unvulcanized tread rubber layer 22. Thereafter, the raw tread ring is molded by vulcanization in a mold and thereby the tread ring 2 is formed.
  • the raw tread ring is molded by vulcanization in a mold and thereby the tread ring 2 is formed.
  • a portion of the sulfur contained in an unvulcanized topping rubber (G) (adjacent rubber 10) penetrates into an adjacent unvulcanized rubber composition (A) and the complex interface layer 11 is formed from sulfur composition and peroxide crosslinking.
  • the interface layer 11 is, compositionally, obtained by adding sulfur to the composition of the rubber composition (A), in which a penetration amount of the sulfur gradually increases toward the topping rubber (G) side. Further, as a physical property of the interface layer 11, an elastic modulus decreases in accordance with the penetration amount of the sulfur with respect to a high elastic modulus of the rubber composition (A). That is, the elasticity in the interface layer 11 gradually decreases toward the topping rubber (G) side so that peeling damage can be suppressed by suppressing stress concentration occurring in the interface portion.
  • the rubber composition (A) tends to be inferior to the sulfur-vulcanized rubber in extensibility and tensile strength.
  • a sandwich structure is adopted in which the reinforcing rubber layer 7 formed of the rubber composition (A) is formed between the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6. Therefore, the reinforcing rubber layer 7 becomes a neutral portion on which both tension and compression do not act, and the above-described problem of extensibility and tensile strength is eliminated. That is, by adopting the sandwich structure, the advantages of the rubber composition (A) can be effectively brought out while the disadvantages of the rubber composition (A) are overcome.
  • a thickness (T) (illustrated in Fig. 9 ) of the reinforcing rubber layer 7 be 3 mm or greater and 70% or less of a thickness (T0) of the tread ring 2.
  • T thickness
  • T0 thickness of the tread ring 2.
  • the content of the sulfur in the topping rubber (G) be 0.5 - 10 phr.
  • the content is below 0.5 phr, the amount of sulfur migrated is small so that it is difficult to form the interface layer 11 and peeling is likely to occur, causing decrease in durability.
  • the content exceeds 10 phr, problems occur in rubber workability and rubber properties.
  • FIG. 11 illustrates an inner side reinforcing cord layer 6 according to another embodiment of the present invention.
  • the third reinforcing cords 66 are arrayed in parallel to the tire axial direction.
  • parallel to the tire axial direction means that the array of the third reinforcing cords 66 is substantially parallel to the tire axial direction.
  • an angle ( ⁇ 3) (not illustrated in the drawings) of the third reinforcing cords 66 with respect to the tire circumferential direction is, for example, about 90 ⁇ 5 degrees.
  • the third reinforcing cords 66 are arrayed in parallel to the tire axial direction, rigidity of the tread ring 2 in the tire axial direction is increased. In this case, when a large slip angle is applied to the airless tire 1, the shape of the ground contact surface 21 is stable. Further, the third cord ply 61 having the third reinforcing cords 66 that are arrayed in parallel to the tire axial direction can ensure the symmetry with respect to a tire circumferential direction line while allowing reduction in weight to be achieved by being a single-layer layer.
  • the symmetry with respect to the tire circumferential direction line is important.
  • the tread ring 2 deforms by distortion, causing a result that smooth rolling is difficult.
  • an angle of belt cords with respect to the tire circumferential direction is limited to a desired range.
  • the angles ( ⁇ 1, ⁇ 2) of the first and second reinforcing cords (56, 57) can be set in a wide range. Specifically, it is desirable that the angles ( ⁇ 1, ⁇ 2) be 5 - 85 degrees. When the angles ( ⁇ 1, ⁇ 2) are less than 5 degrees, the rigidity of the tread ring 2 in the tire axial direction is insufficient, and there is a risk that turning performance may be adversely affected.
  • angles ( ⁇ 1, ⁇ 2) exceed 85 degrees, the rigidity of the tread ring 2 in the tire circumferential direction is insufficient, and there is a risk that straight running performance, or turning performance at a small slip angle, may be adversely affected.
  • a case is illustrated where, in the outer side reinforcing cord layer 5, the first cord ply 51 is formed on the tire radial direction innermost side. However, it is also possible that at least one another cord ply is provided on a further tire radial direction inner side than the first cord ply 51.
  • a case is illustrated where, in the outer side reinforcing cord layer 5, the second cord ply 52 is formed on the tire radial direction outermost side. However, it is also possible that at least one another cord ply is provided on a further tire radial direction outer side than the second cord ply 52.
  • Such cord plies reinforce the tread ring 2 and improve load bearing capability of the airless tire 1, and thus are preferably adopted in tires for large loads such as tires for commercial vehicles.
  • the outer side reinforcing cord layer 5 is structured to further include a fourth cord ply 53, in which fourth reinforcing cords 58 are arrayed, on a tire radial direction outer side of the second cord ply 52.
  • a fourth cord ply 53 in which fourth reinforcing cords 58 are arrayed, on a tire radial direction outer side of the second cord ply 52.
  • Other structures that are not described using Fig. 12 are the same as those in the previous embodiment.
  • the fourth reinforcing cords 58 are arrayed in parallel to the tire circumferential direction (that is, similar to the third reinforcing cords 66, an angle ( ⁇ 4) (not illustrated in the drawings) with respect to the tire circumferential direction is 0 ⁇ 5 degrees).
  • Such fourth reinforcing cords 58 increase the rigidity of the tread ring 2 in the tire circumferential direction. As a result, the shape of the ground contact surface 21 is stable during deceleration and acceleration, and brake performance and traction performance are improved.
  • an elastic modulus (E4) of the fourth reinforcing cords 58 be equal to or less than an elastic modulus (E0) of the first and second reinforcing cords (56, 57).
  • E4 of the fourth reinforcing cords 58 exceeds the elastic modulus (E0)
  • the fourth cord ply 53 becomes a working ply and, when a slip angle is applied to the airless tire 1, a sufficient cornering power cannot be generated and the turning performance is adversely affected.
  • organic fibers such as nylon are preferably adopted.
  • Fig. 13 illustrates an outer side reinforcing cord layer 5 according to yet another embodiment of the present invetion. Other structures that are not described here are the same as those in the previous embodiment.
  • the outer side reinforcing cord layer 5 is structured to further include a fifth cord ply 54, in which fifth reinforcing cords 59 are arrayed, on the tire radial direction inner side of the first cord ply 51.
  • the fifth reinforcing cords 59 are arrayed in parallel to the tire circumferential direction (that is, similar to the third reinforcing cords 66, an angle ( ⁇ 5) (not illustrated in the drawings) with respect to the tire circumferential direction is 0 ⁇ 5 degrees).
  • Such fifth reinforcing cords 59 increase the rigidity of the tread ring 2 in the tire circumferential direction. As a result, the shape of the ground contact surface 21 is stable during deceleration and acceleration, and brake performance and traction performance are improved.
  • Airless tires (tires corresponding to a tire size of 145/70R12) that each form the basic structure of Fig. 7 and 8 were prototyped, and steering stability, rolling resistance and durability were tested.
  • Example 5 an outer side reinforcing cord layer and an inner side reinforcing cord layer are adjacent to each other, and a reinforcing rubber layer is formed on a radial direction inner side of the inner side reinforcing cord layer.
  • a reinforcing rubber layer is formed between an outer side reinforcing cord layer and an inner side reinforcing cord layer.
  • the spoke was formed using a cast molding method using a urethane resin (thermosetting resin), and was integrally formed with the tread ring and the hub.
  • the outer side reinforcing cord layer and the inner side reinforcing cord layer are as follows, and the specifications are the same for each of the tires.
  • rubber compositions of adjacent rubbers are the same and a rubber composition (B) illustrated in Table 4 is used.
  • rubber compositions of reinforcing cord layers are the same and a rubber composition (A) illustrated in Table 4 is used.
  • Comparative Example 4 when a raw tread ring is formed, the outer side reinforcing cord layer 5 and the inner side reinforcing cord layer 6 are pre-vulcanized in advance, and thereby there is no migration of sulfur from the topping rubber, and the interface layer 11 is not formed.
  • Example 5 the content of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt (zinc methacrylate) was too high and thus the rubber became too hard and the tread ring could not be molded by vulcanization. Further, in Example 13, the tread ring became too hard so that it was not possible to measure steering stability, rolling resistance and durability.
  • a drum durability testing machine was used and the tire was run under a condition that a speed is 60 km/hr and a load is 1 kN. Based on a running distance until damage occurred to the tread ring, durability was evaluated using an index with durability of a conventional example 1 as 100. A larger value means a better durability.
  • Example 6 Example 7
  • Example 8 Example 9
  • Example 10 Example 11
  • Rubber Composition Rubber Composition (A) Rubber Composition (B) • Natural Rubber (NR) 0 80 • Butadiene Rubber (BR) 100 20 • Carbon Black 0 40 • ⁇ , ⁇ -Unsaturated Carboxylic Acid Metal Salt (Zinc Methacrylate) 40 0 • Peroxide 1 0 • Sulfur 0 3 • Vulcanization Accelerator 0 1.5 • Zinc Oxide 0 3
  • a conventional rubber material for a pneumatic tire may be used, which is advantageous from a viewpoint of strength, durability, operation stability and grip performance.
  • a load or an impact is received by a tread ring or spoke plates. Therefore, a degree of deformation in an airless tire is increased as compared to a pneumatic tire. Therefore, rigidity and heat generation of a composition that forms a tread ring have large influence on rolling resistance and riding comfort.
  • An airless tire according to an embodiment of the present invention achieves both high elasticity and low fuel consumption at a high level and reduces rolling resistance while ensuring excellent steering stability.
  • An airless tire includes: a cylindrical tread ring that has a ground contact surface; a hub that is positioned on a radial direction inner side of the tread ring and is fixed to an axle; and a spoke that connects the tread ring and the hub.
  • the tread ring includes a tread rubber layer that forms the ground contact surface, and a reinforcing rubber layer that is formed on a tire radial direction inner side of the tread rubber layer, and the reinforcing rubber layer is formed of a rubber composition that contains 10 - 80 parts by weight of an ⁇ , ⁇ -unsaturated carboxylic acid metal salt with respect to 100 parts by mass of a rubber component of which a content rate of butadiene rubber is 10 - 100% by mass, and contains a peroxide.
  • the tread ring further include an outer side reinforcing cord layer that is provided closest to the tread rubber layer, and an inner side reinforcing cord layer that is provided on a tire radial direction inner side of the outer side reinforcing cord layer, and the reinforcing rubber layer be provided between the outer side reinforcing cord layer and the inner side reinforcing cord layer.
  • a ratio (E* 30 /tan ⁇ 30 ) between a complex elastic modulus (E* 30 ) (unit: MPa) and a loss tangent (tan ⁇ 30 ) at 30 °C be 700 or greater.
  • the outer side reinforcing cord layer include a first cord ply that has first reinforcing cords that are arrayed inclined with respect to a tire circumferential direction, and a second cord ply that is provided on a tire radial direction outer side of the first cord ply and has second reinforcing cords that are arrayed inclined with respect to the tire circumferential direction at an angle same as and in an orientation opposite to the first reinforcing cords, and the inner side reinforcing cord layer include a third cord ply that has third reinforcing cords that are arrayed parallel to the tire circumferential direction or to the tire axial direction.
  • the complex elastic modulus (E* 30 ), and the loss tangent (tan ⁇ 30 ) are values measured by using a viscoelasticity spectrometer VES (manufactured by Iwamoto Seisakusho Co., Ltd.) at a temperature of 30 °C, a frequency of 10 Hz, an initial strain of 10% and a dynamic strain of ⁇ 1%.
  • VES viscoelasticity spectrometer
  • the rubber composition that contains the butadiene rubber, the ⁇ , ⁇ -unsaturated carboxylic acid metal salt and the peroxide is used for the reinforcing rubber layer of the tread ring.
  • the butadiene rubber and the unsaturated carboxylic acid metal salt co-crosslink with each other with the peroxide as an initiator, and thereby, excellent physical properties including high elasticity and low fuel consumption can be obtained.
  • rolling resistance can be reduced while ensuring excellent steering stability.
  • a rubber composition according to an embodiment of the present invention tends to be inferior to a conventional rubber member for a pneumatic tire in extensibility and tensile strength.
  • the reinforcing rubber layer that is formed of the rubber composition is formed between the outer side reinforcing cord layer and the inner side reinforcing cord layer, the problem of extensibility and tensile strength is eliminated.
  • An airless tire according to another embodiment of the present invention ensures excellent steering stability and reduces rolling resistance by using a butadiene rubber composition that contains an ⁇ , ⁇ -unsaturated carboxylic acid metal salt as a crosslinking agent for a reinforcing rubber layer of a tread ring and improves durability by suppressing peeling between the reinforcing rubber layer and an adjacent rubber by providing an interface layer that buffers an elasticity difference.
  • An airless tire includes: a cylindrical tread ring that has a ground contact surface; a hub that is formed on a radial direction inner side of the tread ring and is fixed to an axle; and a spoke that connects the tread ring and the hub.
  • the tread ring includes a tread rubber layer that forms the ground contact surface, and a reinforcing rubber layer that is formed on a tire radial direction inner side of the tread rubber layer.
  • the reinforcing rubber layer is formed of a rubber composition that contains 10 - 80 parts by weight of an ⁇ , ⁇ -unsaturated carboxylic acid metal salt with respect to 100 parts by mass of a rubber component of which a content rate of butadiene rubber is 10 - 100% by mass, and contains a peroxide, and has an interface layer at an interface portion between the reinforcing rubber layer and an adjacent rubber that is adjacent to the reinforcing rubber layer, the interface layer buffering an elasticity difference between the reinforcing rubber layer and the adjacent rubber by gradually reducing elasticity from the reinforcing rubber layer toward the adjacent rubber.
  • the tread ring include an outer side reinforcing cord layer that is formed closest to the tread rubber layer and an inner side reinforcing cord layer that is provided on a tire radial direction inner side of the outer side reinforcing cord layer, and the reinforcing rubber layer be formed between the outer side reinforcing cord layer and the inner side reinforcing cord layer, and that a topping rubber of the outer side reinforcing cord layer and the inner side reinforcing cord layer form the adjacent rubber.
  • the topping rubber be formed of sulfur-vulcanized rubber using sulfur as a vulcanizing agent, and that the interface layer be formed by allowing a portion of the sulfur in the topping rubber to migrate to the reinforcing rubber layer side during vulcanization.
  • a content of the sulfur in the topping rubber be 0.5 - 10 phr.
  • the reinforcing rubber layer have a thickness of 3 mm or greater and 70% or less of a thickness of the tread ring.
  • the rubber composition that contains the butadiene rubber, the ⁇ , ⁇ -unsaturated carboxylic acid metal salt and the peroxide is used for the reinforcing rubber layer of the tread ring.
  • the butadiene rubber and the unsaturated carboxylic acid metal salt co-cross-link with each other with the peroxide as an initiator, and thereby, physical properties excellent in elasticity and low fuel consumption can be obtained.
  • rolling resistance can be reduced while excellent steering stability is ensured.
  • the interface layer is provided in which elasticity is gradually reduced from the reinforcing rubber layer toward the adjacent rubber. Therefore, stress concentration can be prevented by buffering the elasticity difference between the reinforcing rubber layer and the adjacent rubber, and occurrence of peeling at the interface portion can be suppressed and durability of the tread ring can be improved.
  • a rubber composition according to an embodiment of the present invention tends to be inferior to a conventional rubber member for a pneumatic tire in extensibility and tensile strength.
  • the reinforcing rubber layer that is formed of the rubber composition is formed between the outer side reinforcing cord layer and the inner side reinforcing cord layer, the problem of extensibility and tensile strength is eliminated.

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Claims (15)

  1. Pneu sans air comprenant :
    un anneau de bande de roulement ayant une forme cylindrique et une surface de contact avec le sol ;
    un moyeu positionné sur un côté intérieur dans la direction radiale de l'anneau de bande de roulement et configuré pour être fixé à un axe ; et
    une structure de rayons formée de façon que la structure de rayons connecte l'anneau de bande de roulement et le moyeu,
    dans lequel l'anneau de bande de roulement comprend une couche de caoutchouc de bande de roulement formant la surface de contact avec le sol,
    caractérisé en ce que
    l'anneau de bande de roulement comprend en outre une couche de caoutchouc de renforcement formée sur un côté intérieur, dans la direction radiale du pneu, de la couche de caoutchouc de bande de roulement, et la couche de caoutchouc de renforcement est formée d'un matériau en caoutchouc obtenu par co-réticulation d'une composition de caoutchouc comprenant un composant caoutchouc, un sel de métal et d'acide carboxylique à insaturation α,β, et un peroxyde, de façon que le sel de métal et d'acide carboxylique à insaturation α,β soit présent en une quantité située dans la plage allant de 10 parties en poids à 80 parties en poids pour 100 parties en masse du composant caoutchouc, et que le composant caoutchouc ait une teneur en caoutchouc de butadiène située dans la plage allant de 10 % en masse à 100 % en masse.
  2. Pneu sans air selon la revendication 1, dans lequel l'anneau de bande de roulement comprend une couche de fils câblés de renforcement du côté extérieur formée au plus près de la couche de caoutchouc de bande de roulement, et une couche de fils câblés de renforcement du côté intérieur formée sur un côté intérieur, dans la direction radiale du pneu, de la couche de fils câblés de renforcement du côté extérieur, de façon que la couche de caoutchouc de renforcement soit positionnée entre la couche de fils câblés de renforcement du côté extérieur et la couche de fils câblés de renforcement du côté intérieur.
  3. Pneu sans air selon la revendication 2, dans lequel la couche de fils câblés de renforcement du côté extérieur comprend un premier pli de fils câblés comprenant une pluralité de premiers fils câblés de renforcement et un deuxième pli de fils câblés comprenant une pluralité de deuxièmes fils câblés de renforcement de façon que les premiers fils câblés de renforcement soient disposés inclinés selon un certain angle par rapport à la direction circonférentielle du pneu, que le deuxième pli de fils câblés soit formé sur un côté extérieur, dans la direction radiale du pneu, du premier pli de fils câblés, et que les deuxièmes fils câblés de renforcement soient disposés inclinés selon le même angle que l'angle des premiers fils câblés de renforcement par rapport à la direction circonférentielle du pneu dans une direction opposée à l'orientation des premiers fils câblés de renforcement, et la couche de fils câblés de renforcement du côté intérieur comprend un troisième pli de fils câblés comprenant une pluralité de troisièmes fils câblés de renforcement disposés parallèlement à la direction circonférentielle du pneu ou une pluralité de troisièmes fils câblés de renforcement disposés parallèlement à la direction axiale du pneu.
  4. Pneu sans air selon l'une quelconque des revendications 1 à 3, dans lequel la couche de caoutchouc de renforcement a un rapport E*30/tanδ30 de 700 ou plus, où E*30 est le module élastique complexe et tanδ30 est la tangente de perte, qui sont mesurés au moyen d'un spectromètre de viscoélasticité VES à une température de 30°C, une fréquence de 10 Hz, une déformation initiale de 10 % et une déformation dynamique de ±1 %.
  5. Pneu sans air selon la revendication 4, dans lequel le module élastique complexe E*30 de la couche de caoutchouc de renforcement est de 75 MPa ou plus.
  6. Pneu sans air selon l'une quelconque des revendications 1 à 5, dans lequel le peroxyde comprend du peroxyde de dicumyle, et le sel de métal et d'acide carboxylique à insaturation α,β comprend du méthacrylate de zinc.
  7. Pneu sans air selon l'une quelconque des revendications 1 à 6, dans lequel le composant caoutchouc comprend du caoutchouc naturel et du caoutchouc de butadiène, le peroxyde comprend du peroxyde de dicumyle, et le sel de métal et d'acide carboxylique à insaturation α,β comprend du méthacrylate de zinc.
  8. Pneu sans air selon l'une quelconque des revendications 1 à 7, dans lequel le peroxyde est présent en une teneur située dans la plage allant de 0,1 partie en poids à 6,0 parties en poids pour 100 parties en poids du composant caoutchouc.
  9. Pneu sans air selon l'une quelconque des revendications 1 à 8, dans lequel la composition de caoutchouc du matériau en caoutchouc ne contient pas d'agent de vulcanisation.
  10. Pneu sans air selon la revendication 1, dans lequel l'anneau de bande de roulement comprend une couche de caoutchouc adjacente qui est formée adjacente à la couche de caoutchouc de renforcement, et une couche d'interface formée à l'interface entre la couche de caoutchouc de renforcement et la couche de caoutchouc adjacente et ayant une élasticité qui est graduellement réduite depuis la couche de caoutchouc de renforcement vers la couche de caoutchouc adjacente de façon que la couche de caoutchouc à l'interface tamponne la différence d'élasticité entre la couche de caoutchouc de renforcement et la couche adjacente.
  11. Pneu sans air selon la revendication 10, dans lequel l'anneau de bande de roulement comprend une couche de fils câblés de renforcement du côté extérieur formée au plus près de la couche de caoutchouc de bande de roulement, et une couche de fils câblés de renforcement du côté intérieur formée sur un côté intérieur, dans la direction radiale du pneu, de la couche de fils câblés de renforcement du côté extérieur, de façon que la couche de caoutchouc de renforcement soit positionnée entre la couche de fils câblés de renforcement du côté extérieur et la couche de fils câblés de renforcement du côté intérieur, la couche de fils câblés de renforcement du côté extérieur comprend une couche de caoutchouc de gommage formant une couche de caoutchouc adjacente qui est formée adjacente à la couche de caoutchouc de renforcement, la couche de fils câblés de renforcement du côté intérieur comprend une couche de caoutchouc de gommage formant une couche de caoutchouc adjacente qui est formée adjacente à la couche de caoutchouc de renforcement, et l'anneau de bande de roulement comprend une pluralité de couches d'interface formées chacune à l'interface entre la couche de caoutchouc de renforcement et la couche de caoutchouc adjacente respective et ayant une élasticité qui est graduellement réduite depuis la couche de caoutchouc de renforcement vers la couche de caoutchouc adjacente de façon que la couche de caoutchouc à l'interface tamponne les différences d'élasticité entre la couche de caoutchouc de renforcement et la couche de caoutchouc adjacente.
  12. Pneu sans air selon la revendication 11, dans lequel chacune des couches de caoutchouc de gommage est faite d'un caoutchouc vulcanisé au soufre, et chacune des couches d'interface comprend du soufre ayant migré depuis le caoutchouc vulcanisé au soufre dans l'une respective des couches de caoutchouc de gommage durant la vulcanisation.
  13. Pneu sans air selon l'une quelconque des revendications 10 à 12, dans lequel la couche de caoutchouc de renforcement a une épaisseur de 3 mm ou plus et de 70 % ou moins de l'épaisseur de l'anneau de bande de roulement.
  14. Pneu sans air selon l'une quelconque des revendications 10 à 13, dans lequel l'au moins une couche de caoutchouc adjacente est faite d'un caoutchouc vulcanisé au soufre, et la couche d'interface comprend du soufre ayant migré depuis le caoutchouc vulcanisé au soufre dans la couche de caoutchouc adjacente durant la vulcanisation.
  15. Pneu sans air selon l'une quelconque des revendications 10 à 14, dans lequel l'au moins une couche de caoutchouc adjacente a une teneur en soufre située dans la plage allant de 0,5 phr à 10 phr.
EP16158371.1A 2015-03-05 2016-03-03 Pneu sans air Active EP3064371B1 (fr)

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